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/* Any copyright is dedicated to the Public Domain.
http://creativecommons.org/publicdomain/zero/1.0/ */
"use strict";
/**
* Tests if the profiler actor returns its buffer status via getBufferInfo.
*/
const Profiler = Cc["@mozilla.org/tools/profiler;1"].getService(Ci.nsIProfiler);
const INITIAL_WAIT_TIME = 100; // ms
const MAX_WAIT_TIME = 20000; // ms
const MAX_PROFILER_ENTRIES = 10000000;
function run_test()
{
// Ensure the profiler is not running when the test starts (it could
// happen if the MOZ_PROFILER_STARTUP environment variable is set).
Profiler.StopProfiler();
get_chrome_actors((client, form) => {
let actor = form.profilerActor;
check_empty_buffer(client, actor, () => {
activate_profiler(client, actor, startTime => {
wait_for_samples(client, actor, () => {
check_buffer(client, actor, () => {
deactivate_profiler(client, actor, () => {
client.close().then(do_test_finished);
});
});
});
});
});
});
do_test_pending();
}
function check_empty_buffer(client, actor, callback)
{
client.request({ to: actor, type: "getBufferInfo" }, response => {
do_check_true(response.position === 0);
do_check_true(response.totalSize === 0);
do_check_true(response.generation === 0);
callback();
});
}
function check_buffer(client, actor, callback)
{
client.request({ to: actor, type: "getBufferInfo" }, response => {
do_check_true(typeof response.position === "number");
do_check_true(typeof response.totalSize === "number");
do_check_true(typeof response.generation === "number");
do_check_true(response.position > 0 && response.position < response.totalSize);
do_check_true(response.totalSize === MAX_PROFILER_ENTRIES);
// There's no way we'll fill the buffer in this test.
do_check_true(response.generation === 0);
callback();
});
}
function activate_profiler(client, actor, callback)
{
client.request({ to: actor, type: "startProfiler", entries: MAX_PROFILER_ENTRIES }, response => {
do_check_true(response.started);
client.request({ to: actor, type: "isActive" }, response => {
do_check_true(response.isActive);
callback(response.currentTime);
});
});
}
function deactivate_profiler(client, actor, callback)
{
client.request({ to: actor, type: "stopProfiler" }, response => {
do_check_false(response.started);
client.request({ to: actor, type: "isActive" }, response => {
do_check_false(response.isActive);
callback();
});
});
}
function wait_for_samples(client, actor, callback)
{
function attempt(delay)
{
// No idea why, but Components.stack.sourceLine returns null.
let funcLine = Components.stack.lineNumber - 3;
// Spin for the requested time, then take a sample.
let start = Date.now();
let stack;
do_print("Attempt: delay = " + delay);
while (Date.now() - start < delay) { stack = Components.stack; }
do_print("Attempt: finished waiting.");
client.request({ to: actor, type: "getProfile" }, response => {
// At this point, we may or may not have samples, depending on
// whether the spin loop above has given the profiler enough time
// to get started.
if (response.profile.threads[0].samples.length == 0) {
if (delay < MAX_WAIT_TIME) {
// Double the spin-wait time and try again.
do_print("Attempt: no samples, going around again.");
return attempt(delay * 2);
} else {
// We've waited long enough, so just fail.
do_print("Attempt: waited a long time, but no samples were collected.");
do_print("Giving up.");
do_check_true(false);
return;
}
}
callback();
});
}
// Start off with a 100 millisecond delay.
attempt(INITIAL_WAIT_TIME);
}
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